Stable inorganic tandem solar cells
Master projects/internships - Genk | Just now
Unlocking the Future of Solar Energy: High band gap CIGS Solar Cells for Tandem Applications
Solar energy is the fastest-growing renewable energy source, consistently outperforming even the most optimistic forecasts. With continuous improvements in efficiency, rapid manufacturing processes, and exceptional reliability, solar panels are driving the global transition toward a fossil fuel-free future. However, conventional silicon (Si) solar panels—currently dominating the market—are approaching their theoretical efficiency limit.
The next breakthrough in photovoltaics lies in tandem solar cells. By stacking multiple cells with different bandgaps, tandem architectures can surpass the efficiency of single-junction devices. This is where thin-film technologies become essential.
Why CIGS Technology?
Cu(In,Ga)(Se,S) (CIGS) is a well-established thin-film technology known for its high stability and tunable bandgap, typically around 1.1–1.2 eV. By adjusting the Se/S and In/Ga ratios, bandgaps above 1.6 eV can be achieved, making CIGS an excellent candidate for the top cell in tandem structures. Recent results have demonstrated efficiencies exceeding 16% for the high band gap CIGS solar cells on semi-transparent substrates, confirming its suitability for this application.
About the Project
This project focuses on developing high-bandgap CIGS solar cells (>1.6 eV) on semi-transparent substrates, optimized for tandem applications. Using scalable deposition techniques such as evaporation and sputtering, we aim to adapt the technology for flexible platforms. By combining these top cells with low-bandgap materials like Si or Cu(In,Ga)Se₂, we will fabricate 4-terminal tandem solar cells. When thin-film is used as the bottom cell, fully lightweight tandem devices become possible—hence, deposition on lightweight substrates will also be explored.
Research activities include:
- Developing high-bandgap CIGS single-junction solar cells on semi-transparent and lightweight substrates.
- Performing standard characterization (JV, EQE, dark measurements) and optical analysis (reflection and transmission) of the top cell.
- Fabricating 4T tandem solar cell stacks, including lightweight configurations.
Why Join Us?
As a master’s student, you will become part of imec’s world-class PV technology group at the EnergyVille Campus in Genk, equipped with cutting-edge research facilities. You will collaborate with leading experts in thin-film and wafer-based technologies, contributing to innovations that shape the future of solar energy.
If you are passionate about renewable energy and eager to explore advanced photovoltaics, this project offers a unique opportunity to make a real impact!
Type of Internship: Master internship; Combination of internship and thesis
Master's degree: Master of Science; Master of Engineering Technology
Required educational background: Chemistry/Chemical Engineering; Physics; Materials Engineering; Nanoscience & Nanotechnology
Duration: 1 year
University Promotor: Bart Vermang (UHasselt)
For more information or application, please contact the supervising scientists Jessica de Wild (jessica.dewild@imec.be) and Guy Brammertz (guy.brammertz@imec.be).
Imec allowance will be provided for students studying at a non-Belgian university.